Bunker “C” is foul stuff. We used to use it in several plants I worked in. It has to be heated before you can even pump it, it’s so thick. When burned properly, it does put out a lot of sulphur fumes, as it has so much sulphur in it.

As for causing deaths? Unless you are constantly inhaling thick fumes, it’s a rare, uncomfortable inconvenience to any other than those super-sensitized.